diff --git a/doc/diffutils.texi b/doc/diffutils.texi
index 69b31da..1d89353 100644
--- a/doc/diffutils.texi
+++ b/doc/diffutils.texi
@@ -4750,13 +4750,14 @@ and @command{patch} should be extended to understand these extensions.
 @subsection File Names that Contain Unusual Characters
 @cindex file names with unusual characters
 
-When a file name contains an unusual character like a newline or
-white space, @samp{diff -r} generates a patch that @command{patch} cannot
-parse.  The problem is with format of @command{diff} output, not just with
-@command{patch}, because with odd enough file names one can cause
-@command{diff} to generate a patch that is syntactically correct but
-patches the wrong files.  The format of @command{diff} output should be
-extended to handle all possible file names.
+Since diffutils-3.3, file names have been encoded to eliminate the ambiguity
+of unusual characters like newline and TAB.
+However, since any file name containing a newline may easily cause trouble,
+in so many contexts (not just diff and patch), a future version of
+diff may well reject attempts to operate on such names.
+@c FIXME-in-2026 consider rejecting NL-afflicted file names
+@c keep an eye on POSIX, e.g.,
+@c https://pubs.opengroup.org/onlinepubs/9799919799/utilities/diff.html
 
 @node Timestamp Order
 @subsection Outputting Diffs in Timestamp Order